Cupola-furnace



(No Model.)

F. W. GORDON.

OUPOLA PURNAGB.

No. 308.665. I Patented Dec. 2, 1884.

- HEW-W5 Attorney ceiving apertures arranged through the wall UNITED STATES PATENT Orrrcn.

FRED. \V. GORDON, OF PITTSBURG, PENNSYLVANIA.

CUPOLA FURNACE.

SPECiPICATIOW forming part of Letters Patent No. 308,665, dated December 2, 1884.

Application filed February 18, 1884. (No model.)

To all whom it may concern: 1

Be it known that I, FRED. WV. GORDON, of Pittsburg, Allegheny county, Pennsylvania, have invented certain new and useful Improvements in Oupola-Furnaces, of which the following is a specification.

This invention pertains to that class of cupola-furnaces in which the blast is injectedbelow the surface of the molten metal, as in case the furnace is used for the treatment of molten iron for the purposes of purification-or con version.

Heretofore in furnaces or converters arranged for such use the force of the blast served to keep the molten metal from entering the immersed tuyeres.

In some forms of convertersas Bessemer, for instance-care is always taken to keep the blast on so long as the tuyere-apertures are exposed to the inflow of the metal-that is, the converter is either tipped or empty when the blast is off. I In other forms of converting-furnaces where the tuyere-apertures are below the surface of the molten metal, stoppers are provided, by which the tuyeres can be closed previous to or at the time of shutting off the blast.

My invention relates to suchan arrangement of the tuyeres with reference to the walls of the converting-furnace that the tuyeres may be withdrawn at an angle from the molten metal in which they are im'mersed during the blow, leaving tuyere-receiving apertures in the furnace-walls so disposed at an angle that the metal-will not flow from them, thereby dispensing with the necessity of tuyere-stoppers or tipping furnaces.

The invention will befully understood from the following description, read in connection with the accompanying drawing, which is a vertical diametrical section of a cup Ola-furnace illustrative of my improvements.

In the drawing, A represents the lower or vessel portion of a furnace adapted to receive a charge of molten metal; B, the upper portion or stack of the same;,O, the horizontal line of separation between the vessel and stack part; D, an ordinary bustle-pipe, through which the blast is transmitted from the blowing machincry; I}, a circumferential series of tuyere-reof the vessel at an angle, the lower end of each tuyere and arranged with its axis coinciding with the axis of its appropriate tuyere-aperture in the vessel; H, the tuyere-pipe, fitted to move longitudinally in its tuyere-aperture and tuyere-stock; I, a tuyere at the lower extremity of the tuyere-pipe; J, a pinion carried by the tuyere-stock and engaging asuitable rack in the tuyere-pipe; K, a crank upon the shaft of the pinion, and L the line or surface of the molten metal in the vessel. As many tuyeres may be employed asis deemed desirable. The drawing represents the vessel as provided with. apertures for six tuyeres. One tuyere is shown in blowing position, and all of the tuyeres employed are to be similarly arranged. By means of the rack-and-pinion movement the tuyeres may be elevated out of the molten metal and withdrawn entirely from the wall of the vessel, permitting the metal to enter the tuyereapertures in the vessel-wall without danger of flowing from them. All of the tuyeres may, if desired,be geared to operate simultaneously, and instead of the hand movement the tuyeres may be arranged to adjust by means of power from steam or compressed air, or by other means. NVhen the tuyeres are withdrawn, the vessel, with its contained charge of molten metal, is at liberty to separate from its stack and be transported to a new position for pouring, which operation of pouring is performed by drawing off the metal through the tappinghole. It is desirable that the blast be not shut off until the tuyeres have been entirely withdrawn from the molten metal; but with tuyeres constructed of material sufficiently refractory the observance of this rule is not essentially imperative.

The tuyeres, instead of being connected with the bustle-pipe, may obviously be independently connected to a blast-main arranged otherwise than around the furnace.

ICO

It is not new in furnace practice to insert the tuyeres at an angle, so as to produce a plunging blast, nor to have tuyeres thus arranged with their noses immersed in the molten metal; but in all such cases the tuyeres have been inserted metal-tight in their breasts, and have essentially required water-cooling devices to prevent their destruction when the blast was cut off. Hollow air-injecting pnddling-tools have been inserted at an angle through furnacewalls and fitted to reciprocate; but no provision has been made for preserving the toolnoses when the blast was cut off, in case the molten metal stood above the level of the apertures through which the tools were inserted.

I claim as my invention- 1. The combination of awalled vessel adapted to receive a charge of molten metal, a circumferential series of tuyere-receiving apertures through the wall of said vessel, each aperture being arranged at an angle with its interior end below the metal-line of the vessel and its exterior end above the metal-line of the vessel, and tuyercs fitted to reciprocate through said apertures into the bath of metal and connected with a source of blast, and mechanism for withdrawing the tuyeres from the wall of the vessel.

2. The combination of awalled vessel ad apted to receive a charge of molten metal, a circulnferential series of tuyere-receiving apertures arranged in the wall of said vessel and disposed angularly, and with their interior ends below the metal-line, as set forth, astack part above said vessel, but separated from it, and retractile tuyeres fitted to be reciprocated through said apertures, protruded into and withdrawn from the charge of molten metal, and protruded inward through or withdrawn entirely from the vessel-wall.

FRED. V. GORDON.

\Vitnesses:

THOMAS DEEGAN, V. 0. STROBEL. 

